What codec is appropriate for posting? I'm a Mac guy, so all my planetary movies are in an Astro IIDC proprietary codec. With .avi's I used divx which is pretty standard and gives a small file size. Less compressed .avi's may be so slow to download that people won't bother. I understand that most planetary guys use Registrax, which I'm told is fussy about codecs. The interesting question is whether Registrax can give noticeably better results than Astro IIDC on the Mac side.
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